Determine index of a JS object in array while knowing the object value

Question

How do I determine what the index of an object is within an array?

Take the following setup:

var item =  [
        {
            identifier: "id1",
        },
        {
            identifier: "id2",
        },
        {
            identifier: "id3",
        }
];

I know what the object value is and that it exists and currrently have it stored like this currentValue = "id2";

What i'd like to know is that "id2" equals to (in this case) index 1.

adeneo · Accepted Answer · 2015-03-21 22:45:41Z

1

The only way is to iterate and check each property

var currentValue = "id2";

var item =  [
        {
            identifier: "id1",
        },
        {
            identifier: "id2",
        },
        {
            identifier: "id3",
        }
];

var index = 0;

item.forEach(function(obj, i) {
    if ( obj.identifier === currentValue ) {
         index = i;
         return false;
    }
});


document.body.innerHTML = index;

answered Mar 21, 2015 at 22:45

adeneo

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